[Haskell-cafe] FFI: how to allocate a const char * from haskell

[PICCA Frederic-Emmanuel]

Hello, I need to call a c method which take a const char *

something like

void hkl_holder_add_axis(const struct holder *holder, const char *name);

during all the life of this object, the const char* should be accessible.

So from haskell I need to create a CString which will not be affected by the garbage collection.
The memory should be release only when the given object is freed. or when the program stop.

when I use alloca, the memory is releases and the code segfault.

I think that I could use malloc, but in that case I have a memory leak. (this is not that important in my case, since I create less than 10 of these objects).

I would like you advice in order to solve this properly.

thanks for your help.

Frederic